Flush valve



Patented June 1, 193? s UNITED STATES ATENT OFFICE FLUSH VALVE Sedley S. Stafford, San Francisco, Calif., assignor to Dalmo Sales Corporation, San Francisco, Calif., a corporation of California Application August '7, 1936, Serial No. 94,787

l Claim. (Cl. 137-93) This invention relates generally to pressure which can be constructed as follows: Extending operated iiush valves of the type used in condownwardly from the piston, into the sleeve I5, junction with water closets. there is a collar 26. Webs 21, formed on the collar It is an object of the invention to provide a 26, engage the inner peripheral surface of the flush valve of the above character having nonsleeve I5, and serve to guide the Piston I9 nits syphoning characteristics. Ihave reference to the vertical movements. At the upper end of the fact that my valve prevents sucking of contamicollar 2B there is an annular shoulder 28. Carrying nated water from the bowl back into the watera ring 29 0f resilient rubber Or like material supply line, when the pressure of the water line Loosely supported upon the upper face of ring 29, falls below atmospheric. there is a pilot Valve member 3|, to which the 10 Another object of the invention is to provide depending stem 32 is secured The cap 22 Carries a non-syphoning iiush valve of utmost simplicity, a depending pin 34. the Wer end 0f Wheh is without resorting to the use of cheek valves or adapted to engage the pilot Valve member 3l, and like unsatisfactory devices. thus limit upward movement of the piston I9.

Further objects of the invention will appear For opening the DlOt ValVe member 24, t0 15 from the following description in which the preinitiate a Cycle 0f Operai/i011, there is an Operating ferrecl embodiment of the invention has been set handle 36. This handle has a swivel mounting in forth in detail in conjunction with the accoma tting 31, and the head 38 formed 0n its inner panying drawing. end is adapted to engage and operate a sliding Referring to the drawing: plunger 39. It will be noted that the inner end 20 Fig. l is a side elevational View, in cross section, of plunger 39 extends through an aperture formed illustratinga iiush valve incorporating the present in sleeve I5, and that when the plunger is proinvention. jected, it effects a lateral displacement of the pilot Fig. 2 is a cross-sectional view taken along the valve stem 32. line 2--2 of Fig. l. Disposed immediately above the `outlet I2 there 25 Fig. 3 is a cross-sectional view taken along the is a restricted discharge nozzle 4 I shaped to conline 3-3 of Fig. 1. form substantially to a Venturi tube. 'Ihis nozzle Fig. 4 is a fragmentary cross-section of a modiis preferably formed integral with the lower end lied form of the flush valve shown in Fig. 1. of the cylindrical sleeve I5. Surrounding the 'Ihe iiush valve illustrated in the drawing connozzle 4I there is an annular space 42, which is in 30 sists of a hollow body ID, provided with inflow and communication with a pocket 43 located around outflow openings II and I2. The inflow opening the sleeve I5. The pocket 43 is in turn vented to I I is adapted to be connected to the water supply the atmosphere through openings 44. A suitable pipe I3, while the outflow opening I2 is adapted cap 46 is mounted upon the valve body, and to be connected to a pipe I4, leading to a closet serves as a protection for the openings 44.

bowl. Mounted within the body I0 there is a cy- Operation of my valve can now be briefly delindrical sleeve I5, the upper end of which is scribed as f0lloWs:-When force` is applied to formed to provide a valve seat I6. Cooperating the handle 3B, plunger 39 is projected inwardly, with the seat I6 there is a valve ring IT, formed to laterally displace the pilot valve stem 32, to of rubber or composition, and shown carried open the pilot valve member 3l, thus permitting 40 within a groove I8, formed in the piston I9. water under pressure to escape from chamber 23. The body Ill is formed to provide a cylindrical The upward force of water upon the piston I9, bore or cylinder 2l in which the piston IS is slidfrom the inlet side of the valve, causes the piston ably fitted. The upper end of the valve body is IS to rise, thus permitting water to how down 45 shown closed by the cap 22, and the space between through the Sleeve l5, t0 be discharged as a jet this cap and the piston I9, forms a uid pressure inte the Pipe |4 Such .letting 0f Water from chamber 23. sufficient clearance is provided benozzle 4l causes Space 42 t0 be partially evacutween the peripheral surface of piston I9, and the ated by Virtue 0f an asnrating aetiOn, With the adjacent surfaces of the cylinder bore 2| so that result that air from the atmosphere is sucked in the pressure chamber 23 is in restricted communithrough Openings 44- UDCH raising 0f the piston 50 cation with the inlet passage II. It will be evident i9, pilot Valve member 3| is again Closed, and that the lower portion of piston I9, together with as water pressure builds up in Chamber 23, the ring I1, forms a main valve member for a conpiston moves downwardly to again engage ring trolling flow of Water through the valve body. I'I with the seat I6.

The piston I9 also carries pilot valve means 24, If water pressure on the inflow side of the 55 valve falls below atmospheric, either when the valve is closed, or during operation of the same, no water can be syphoned back through the device, because air is sucked from the atmosphere through openings 44, in preference to sucking back water from the pipe I4. Thus my valve is positive in its non-syphoning action, and this characteristic is obtained without the use of check valves or like devices, which require diierentlal 10 uid pressures for their operation.

Under certain conditions of operation, I have found that with the device as described above, there may be a back swirl of water from the pipe I4, suicient to discharge a small amount 15 of Water from the vent 44. This can be avoided by the construction of Fig. 4. In this instance, in place of using only onernozzle Ma, a second nozzle or Venturi throat 48 is disposed immediately below the same. The opening in nozzle 48 20 is slightly larger than the opening in nozzle Ma, and' the two openings are aligned. Thus while any `syphoning is broken as in the modiiication previously described, the second nozzle 48 prevents swirling water from discharging through 25 vent '44.

I claim:

`In a flush valve, a valve body having an inlet Cil for connection with a source of Water under pressure and also having a downwardly directed out let for connection with a closet bowl, a sleeve fitted Within Said body, the upper end of said sleeve forming a valve seat, a movable valve member cooperating with the valve seat, a iiuid pressure operated member connected to the valve member, there being a closed space above said fluid operated member forming a pressure chamber having restricted communication with the inflow side of the valve body, a pilot valve member adapted to vent said space, an operating member inovably carried by the valve body and serving to operate said pilot valve member, one side wall of said sleeve having an opening in the same to snugly accommodate the operating member, whereby the operating member may reciprocate in a direction substantially at right angles to the axis o1" the sleeve, a downwardly directed restricted flow nozzle located Within the valve body and formed integral with the lower end of said sleeve, there being a space surrounding said nozzle adapted to be evacuated by the aspirating effect of water discharged through the same, said space being vented to the atmosphere at a point above the lower end of the nozzle.

SEDLEY S. STAFFORD. 

